Study on spectral lines to improve the measurement accuracy of H2O molecular concentration based on TDLAS technology

Yifan Wang; Jinfeng Zhou; Yu Ju; Xiaosong Shi; Yuhan Zhang; Shaojie Guan

doi:10.1117/12.2667810

27 February 2023 Study on spectral lines to improve the measurement accuracy of H₂O molecular concentration based on TDLAS technology

Yifan Wang, Jinfeng Zhou, Yu Ju, Xiaosong Shi, Yuhan Zhang, Shaojie Guan

Author Affiliations +

Proceedings Volume 12585, International Conference on Precision Instruments and Optical Engineering (PIOE 2022); 1258514 (2023) https://doi.org/10.1117/12.2667810
Event: International Conference on Precision Instruments and Optical Engineering (PIOE 2022), 2022, Guangzhou, China

Abstract

H₂O is an important molecule in the atmosphere, which is closely related to climate change and industrial applications (such as combustion process). The detection of trace water vapor concentration is of great significance in earth ecology and industrial production. Tunable diode laser absorption spectroscopy (TDLAS) inverses the gas concentration by measuring the gas absorption spectrum. The wavelength of the common characteristic absorption peak of H₂O molecule is 7181.16 cm-¹. The spectral absorption peaks of different wavelengths are analyzed in the paper. It is proved that when 7306.75 cm^-1 characteristic absorption peak is used to replace 7181.16 cm^-1 characteristic absorption peak for concentration inversion, the influence can be reduced and the measurement accuracy can be improved by combining the target peak with the interference peak.

Citation Download Citation

Yifan Wang, Jinfeng Zhou, Yu Ju, Xiaosong Shi, Yuhan Zhang, and Shaojie Guan "Study on spectral lines to improve the measurement accuracy of H₂O molecular concentration based on TDLAS technology", Proc. SPIE 12585, International Conference on Precision Instruments and Optical Engineering (PIOE 2022), 1258514 (27 February 2023); https://doi.org/10.1117/12.2667810

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